docs: def config(ctx):
      """Show access token and other configuration settings.
  
      The access token and command verbosity level can be set on the
      command line, as environment variables, and in mapbox.ini config
      files.
      """
      ctx.default_map = ctx.obj['cfg']
      click.echo("CLI:")
      click.echo("access-token = {0}".format(ctx.obj['access_token']))
      click.echo("verbosity = {0}".format(ctx.obj['verbosity']))
      click.echo("")
  
      click.echo("Environment:")
      if 'MAPBOX_ACCESS_TOKEN' in os.environ:
          click.echo("MAPBOX_ACCESS_TOKEN = {0}".format(
              os.environ['MAPBOX_ACCESS_TOKEN']))
      if 'MapboxAccessToken' in os.environ:
          click.echo("MapboxAccessToken = {0}".format(
              os.environ['MapboxAccessToken']))
      if 'MAPBOX_VERBOSE' in os.environ:
          click.echo("MAPBOX_VERBOSE = {0}".format(
              os.environ['MAPBOX_VERBOSE']))
      click.echo("")
  
      if 'config_file' in ctx.obj:
          click.echo("Config file {0}:".format(ctx.obj['config_file']))
          for key, value in ctx.default_map.items():
              click.echo("{0} = {1}".format(key, value))
          click.echo("")